You can put pretty much anything in there, not counting the 3.0" Gazzaloddi, those are just ridiculous. I'm currently running 2.4" Schwalbe BigBetty (62mm across) with plenty of clearance. For comparison, the BigBettys are wider and have a larger volume casing than a Maxxis 2.7... I've had a Highroller 2.7" SR in there with room to spare.